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【简答题】
某大型商场每天接待顾客10000人,设每位顾客消费额(单位:元)服从[100,1000]上的均匀分布,且各顾客消费相互独立,试求该商场销售额在平均销售额上下浮动不超过20000元的概率。
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举一反三
【单选题】At no time does the salesgirl get up late in the morning, for she is always too busy _____ a good rest.
A.
to take
B.
taking
C.
took
D.
taken
【单选题】'Though it is difficult to remember now, this was not always the case.' In the 1st paragragh, this sentence suggests that ______.
A.
today Google has become a commonplace way to find information online
B.
Google made a great contribution to searching online
C.
Google changed a lot
D.
Google is different from other search engines
【简答题】茶叶系统分类法的主要分类依据是( )、( )和( )。
【简答题】We’re always busy with our work. We seldom have _________________________ .
【简答题】9 A: Are you busy
at work right now? B: Yes. We're always busy in November. But ____ month will be slow
because of the holidays.
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